Physical phase-split dynamic polymer and application thereof

Abstract

The invention discloses a physical phase-split dynamic polymer. The physically phase-splitting dynamic polymer contains dynamic polymer molecules including hard segments and soft segments at the sametime. The hard segments of the dynamic polymer molecules are mixed with each other and / or independent to form crystal phases and / or phases incompatible with the soft segments, so phase-split physicalcross-linking or cross-linking and polymerization based on the hard segments is formed; the soft segments of the dynamic polymer molecules are amorphous; the dynamic polymer molecules contain at leastone boron-containing dynamic covalent bond and an optional hydrogen bond group; and the boron-containing dynamic covalent bond and the optional hydrogen bond group provide dynamic reversibility, so the physical phase-split dynamic polymer has good toughness, energy dissipation performance, self repair performance and other performance. The physical phase-split dynamic polymer is extensively applicable to the body protection of people during exercises, daily life and working, the body protection of the military police, explosion prevention, protection in airborne landing and aerial delivery, collision prevention of automobiles, anti-impact protection of electronic materials, self-repairing sealing members, sealants, tough elastomers, etc.

Description

technical field [0001] The invention relates to a dynamic polymer, in particular to a physical phase-separated dynamic polymer containing boron-containing dynamic covalent bonds and polymer molecules with hard segments and soft segments. Background technique [0002] Cross-linking is a general method for polymers to form a three-dimensional network structure to achieve effects such as improving polymer elasticity, thermal stability and mechanical properties. Crosslinking can be chemical (covalent) or physical (non-covalent / supramolecular) crosslinking. Physical crosslinking has become a direction for the development of polymer elastomers because it is especially helpful to improve the processing properties of polymer elastomers. However, when only physical crosslinking is used, if the crosslinking density is low (the chain between crosslinking points is longer / the functionality of crosslinking points is low), the crosslinked polymer tends to be relatively soft and has poor ...

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Problems solved by technology

However, when only physical crosslinking is used, if the crosslinking density is low (the chain between crosslinking points is longer / the functionality of crosslinking points is low), the crosslinked polymer tends to be relatively soft and has poor mechanical properties; However, if the cross-linking density is high (longer chains between cross-linking points / higher cross-linking point functionality), the cross-linked polymer is often hard and brittle, and cannot be used as an elastomer; and in order to maintain the stability of the material The de-crosslinking temperature of physical crosslinking needs to be higher than the working temperature of the material. Therefore, physical crosslinking lacks dynamics at the working temperature of the material.

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